Leach L M, Ellis M, Sutton D S, McKeith F K, Wilson E R
Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
J Anim Sci. 1996 May;74(5):934-43. doi: 10.2527/1996.745934x.
Growth performance, carcass characteristics, and meat quality of halothane carrier (Nn) and negative (NN) pigs grown from 40 kg live weight and slaughtered at three weights (110, 125, and 140 kg live weight) were studied. Daily gains were similar for the two genotypes (974 g for Nn and 964 g for NN), but Nn pigs had a higher gain:feed ratio than NN pigs (P < .01). Dressing percentage was higher in Nn pigs than in NN pigs (P < .001), but there were no genotype differences for carcass length, backfat thickness, or loin eye area. Percentage yield of trimmed, boneless wholesale cuts was higher for Nn pigs than for NN pigs (P < .05). This resulted from higher trimmed, boneless ham, boston, and picnic weights (P < .05) in Nn than in NN pigs (6.9, 3.2, 3.5 kg vs 6.6, 3.0, 3.4 kg, respectively). The weight of fat-free lean was higher in Nn pigs (P < .05). The longissimus thoracis muscle from carrier pigs had lower 45 min (P < .001) and 24 h (P < .01) pH. Longissimus lumborum samples from carriers had lower (P < .001) subjective' meat quality scores and a higher drip loss (P < .001); however, cooking loss, eating quality, and shear force values were similar for the two genotypes. There were no important slaughter weight x genotype interactions for the traits reported. Overall, the data from this study suggest Nn pigs had an advantage over NN pigs in terms of feed efficiency, carcass yield fat-free lean content, and commercial lean cut yields but had a higher incidence of PSE.
研究了从40千克活重开始生长并在三个体重（110、125和140千克活重）时屠宰的氟烷基因携带者（Nn）和阴性（NN）猪的生长性能、胴体特性和肉质。两种基因型的日增重相似（Nn为974克，NN为964克），但Nn猪的增重：饲料比高于NN猪（P < 0.01）。Nn猪的屠宰率高于NN猪（P < 0.001），但胴体长度、背膘厚度或眼肌面积没有基因型差异。Nn猪的修整、去骨批发切块的产量百分比高于NN猪（P < 0.05）。这是因为Nn猪的修整、去骨火腿、波士顿肩肉和野餐肉的重量高于NN猪（P < 0.05）（分别为6.9、3.2、3.5千克和6.6、3.0、3.4千克）。Nn猪的无脂瘦肉重量更高（P < 0.05）。携带基因猪的胸最长肌在45分钟（P < 0.001）和24小时（P < 0.01）时pH值较低。携带基因猪的腰最长肌样本的主观肉质评分较低（P < 0.001），滴水损失较高（P < 0.001）；然而，两种基因型的烹饪损失、食用品质和剪切力值相似。所报告的性状没有重要的屠宰体重×基因型互作。总体而言，本研究的数据表明，Nn猪在饲料效率、胴体产量、无脂瘦肉含量和商业瘦肉切块产量方面比NN猪具有优势，但PSE的发生率较高。
